96 lines
2.4 KiB
Python
96 lines
2.4 KiB
Python
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from itertools import chain
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import re
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filename = 'sample'
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input = [list(i.rstrip()) for i in open(filename).readlines()]
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def generate_horizontal_cross_sections(search):
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return search
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def generate_vertical_cross_sections(search):
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output = []
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for row in range(len(input[0])):
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current = []
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for line in search:
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current.append(line[row])
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output.append(current)
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return output
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def generate_diagonal_cross_sections(search):
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modulo = len(search[0])
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concat = ''.join(chain(*search))
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output = []
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for offset in range(len(concat)):
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current = []
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index = offset
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while index % modulo != 0 and index < len(concat):
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current.append(concat[index])
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index += modulo - 1
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try:
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current.append(concat[index])
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except IndexError:
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pass
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output.append(current)
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output = [i for i in output if len(i) >= 4]
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return output
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def generate_antidiagonal_cross_sections(search):
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# start from the points on the right and bottom edges
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# of the array, and then work northwest diagonally
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indexes_to_start = []
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modulo = len(search[0])
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concat = ''.join(chain(*search))
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index = modulo - 1
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while index < len(concat):
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indexes_to_start.append(index)
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index += modulo
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index -= modulo
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while index % modulo != 0:
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indexes_to_start.append(index)
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index -= 1
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indexes_to_start.append(index)
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# work up northwest
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output = []
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for index in indexes_to_start:
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current = []
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while index % modulo != 0 and index > 0:
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current.append(concat[index])
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index -= modulo + 1
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if index > 0: current.append(concat[index])
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output.append(current)
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output = [i for i in output if len(i) >= 4]
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return output
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search_space = [
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*generate_horizontal_cross_sections(input),
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*generate_vertical_cross_sections(input),
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*generate_diagonal_cross_sections(input),
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*generate_antidiagonal_cross_sections(input),
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]
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xmas = re.compile('XMAS')
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total = 0
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for item in search_space:
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joined = ''.join(item)
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print(joined)
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results = xmas.findall(joined)
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print(results)
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total += len(results)
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joined = ''.join(reversed(item))
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print(joined)
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results = xmas.findall(joined)
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print(results)
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total += len(results)
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print(results)
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